This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 2 | 3 |
| 3 | 7 |
| 4 | 19 |
| 5 | 97 |
| 6 | 823 |
| 7 | 3499 |
| 8 | 2777 |
| 9 | 6827 |
| 10 | 2437 |
| 11 | 21523 |
| 12 | 300299 |
| 13 | 446273 |
| 14 | 339769 |
| 15 | 1168523 |
| 16 | 14117417 |
| 17 | 29227421 |
| 18 | 14160061 |
| 19 | 78521987 |
| 20 | 161187707 |
| 21 | 1200085823 |
| 22 | 2125209127 |
| 23 | 1369430897 |
| 24 | 56378083771 |
| 25 | 26054006611 |
| 26 | 76375900241 |
| 27 | 290373503549 |
| 28 | 640442460709 |